component
ULN2804A
Public Made by Adomby adom
STMicroelectronics Darlington Transistor Arrays, DIP-18. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownULN2804A
STMicroelectronics · Darlington Transistor Arrays · DIP-18
ULN2804A from STMicroelectronics, in a DIP-18. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | IN1 | input | Input of Darlington driver 1 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT1; absolute maximum input voltage 30 V. |
| 2 | IN2 | input | Input of Darlington driver 2 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT2; absolute maximum input voltage 30 V. |
| 3 | IN3 | input | Input of Darlington driver 3 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT3; absolute maximum input voltage 30 V. |
| 4 | IN4 | input | Input of Darlington driver 4 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT4; absolute maximum input voltage 30 V. |
| 5 | IN5 | input | Input of Darlington driver 5 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT5; absolute maximum input voltage 30 V. |
| 6 | IN6 | input | Input of Darlington driver 6 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT6; absolute maximum input voltage 30 V. |
| 7 | IN7 | input | Input of Darlington driver 7 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT7; absolute maximum input voltage 30 V. |
| 8 | IN8 | input | Input of Darlington driver 8 (10.5 kΩ input resistor for 6-15 V CMOS/PMOS on ULN2804A), drives OUT8; absolute maximum input voltage 30 V. |
| 9 | GND | power_in | Common emitter ground of all eight Darlington transistors. |
| 10 | COMMON | passive | Common free-wheeling (suppression) diode cathode connection for inductive loads, with clamp diode forward voltage 2 V max at 350 mA. |
| 11 | OUT8 | output | Open-collector Darlington output 8, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |
| 12 | OUT7 | output | Open-collector Darlington output 7, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |
| 13 | OUT6 | output | Open-collector Darlington output 6, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |
| 14 | OUT5 | output | Open-collector Darlington output 5, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |
| 15 | OUT4 | output | Open-collector Darlington output 4, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |
| 16 | OUT3 | output | Open-collector Darlington output 3, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |
| 17 | OUT2 | output | Open-collector Darlington output 2, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |
| 18 | OUT1 | output | Open-collector Darlington output 1, rated 500 mA continuous (600 mA peak) and 50 V in the OFF state. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | STMicroelectronics |
| Package | DIP-18 |
| Category | Transistors/Thyristors |
| Pins | 18 |
CAD (KiCad official)
- Symbol:
ULN2804A - Footprint:
Package_DIP:DIP-18_W7.62mm - 3D model: DIP-18 (KiCad packages3D, STEP)
- 3D model files:
uln2804a-etched.step/uln2804a-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);uln2804a.step/uln2804a.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: STMicroelectronics datasheet (14 pp, sha256
78d49085c6e74186, retrieved 2026-10-08, tier: manufacturer) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text+vision), consensusclaude-opus-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).